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Fire-resistant insulated cable containing calcined coal series kaolin

A technology of coal-based kaolin and refractory insulation, applied in the direction of insulated cables, insulated conductors, inorganic insulators, etc., can solve the problems of poor insulation, difficult molding, high water absorption of magnesium oxide, etc., to improve insulation, increase filling density, and improve refractoriness Effect

Inactive Publication Date: 2015-03-25
重庆科宝电缆股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a fire-resistant insulated cable containing calcined coal-based kaolin, which solves the problems of high water absorption, poor insulation and difficult molding when only magnesium oxide is used for the current insulating layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Heat 9L of water to 45°C, add 9g of cellulose and 90g of paraffin oil (industrial grade) into the water and stir to dissolve; stir 35kg of calcined coal-based kaolin powder and 56kg of magnesium oxide powder in a stirrer for 8min, and spray the above aqueous solution Put it into the mixer to make the powder have certain humidity and cohesiveness;

[0021] The mixed powder material is pressed into a columnar porcelain column with a pressure of 8 kg by a column press;

[0022] Put the compressed ceramic column into the calciner and heat it at 1180°C for 3 hours, then cool it naturally to 40°C and release it from the furnace.

[0023] Put the porcelain column into the prepared tube blank (9 meters long) with copper as the outer sheath, and position it with a special core rod, and then penetrate the required core blank (10 meters) for repeated pulling , annealing, and sealing processes until the finished product. The porcelain column is transformed into a dense insulating...

Embodiment 2

[0025] Heat 5L of water to 40°C, add 4g of cellulose and 75g of paraffin oil (industrial grade) to the water and stir to dissolve; stir 30kg of calcined coal-based kaolin powder and 50kg of magnesium oxide powder in a stirrer for 6min, and spray the above aqueous solution Put it into the mixer to make the powder have certain humidity and cohesiveness;

[0026] The mixed powder material is pressed into a columnar porcelain column with a pressure of 9 kg by a column press machine;

[0027] Put the compressed ceramic column into the calciner and heat it at 1200°C for 2.5 hours, then let it cool naturally to 50°C.

[0028] Porcelain pillars are put into the prepared tube blank with copper as the conductor and outer sheath, positioned by a special core rod, and then penetrated into the required core blank, and undergo repeated drawing, annealing, and sealing processes until the finished product. The porcelain column is transformed into a dense insulating refractory body, which is ...

Embodiment 3

[0030] Heat 15L of water to 50°C, and add 7.5g of cellulose and 180g of paraffin oil (industrial grade) to the water and stir to dissolve; stir 40kg of calcined coal-based kaolin powder and 60kg of magnesium oxide powder in a stirrer for 7min, and mix the above aqueous solution Spray into the mixer to make the powder have certain humidity and cohesiveness;

[0031] Press the mixed powder material into a columnar porcelain column with a pressure of 10 kg by a column press;

[0032] Put the pressed porcelain column into the calcination furnace and heat and calcine at 1190°C for 2.7 hours, then cool naturally to 45°C and leave the furnace.

[0033] Porcelain pillars are put into the prepared tube blank with copper as the conductor and outer sheath, positioned by a special core rod, and then penetrated into the required core blank, and undergo repeated drawing, annealing, and sealing processes until the finished product. The porcelain column is transformed into a dense insulating...

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PUM

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Abstract

The invention discloses a fire-resistant insulated cable containing calcined coal series kaolin. The fire-resistant insulated cable containing the calcined coal series kaolin comprises a cable core, an insulating layer and a sheath. The insulating layer is mainly made of, by mass, 30-40 parts of the calcined coal series kaolin and 50-60 parts of magnesium oxide in a calcining mode, and is used for replacing the insulating layer, made of magnesium oxide powder, of an existing mineral insulated cable. The insulation resistance and the shortest continuous power-on time during a fire disaster of the fire-resistant insulated cable are higher than the international standards, the fire-resistant insulated cable has a good fire-resistant insulating effect, and the water absorption rate of the fire-resistant insulated cable is lower than the international standard.

Description

technical field [0001] The invention relates to the field of electric wires and cables, in particular to a fire-resistant insulating cable containing calcined coal series kaolin. Background technique [0002] Mineral Insulated Cable (Mineral Insulated Cable) is referred to as MI cable. When used as wiring, it is customarily called magnesium oxide cable or fireproof cable in China. It is a copper-core copper-sheathed cable insulated by mineral material magnesium oxide powder. The mineral insulated cable is composed of two inorganic materials: copper conductor, magnesium oxide and copper sheath. Mineral insulated cable is a cable that uses annealed copper as conductor, dense magnesium oxide as insulation, and annealed copper tube as sheath. If necessary, a plastic outer sheath is extruded outside the annealed copper sheath. Special requirements are smoke-free. In the case of halogen, a layer of low-smoke halogen-free sheath can be added outside. [0003] Mineral insulated ca...

Claims

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Application Information

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IPC IPC(8): H01B3/10H01B7/29
Inventor 畅吉庆韩少华
Owner 重庆科宝电缆股份有限公司
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